Method of manufacturing barium titanate and electronic component of barium titanate

Abstract

A method of manufacturing barium titanate powder by dispersing, in a solvent such as ethanol, barium titanate. Then, the barium titanate is separated from the slurry by evaporating the solvent while pressurizing the slurry in a pressure container. Then, the separated barium titanate is subjected to a heat treatment, thereby producing the barium titanate powder.

The invention claimed is: 
     
       1. A method of manufacturing barium titanate powder the method comprising:
 providing a slurry containing barium titanate dispersed in a solvent; 
 separating the barium titanate from the slurry by evaporating the solvent while pressurizing the slurry; and 
 heat-treating the separated barium titanate to produce the barium titanate powder, wherein the barium titanate that is dispersed in the slurry is obtained by a reaction caused by adding barium hydroxide to a titanium oxide slurry containing titanium oxide powder dispersed in water. 
 
     
     
       2. The method of manufacturing barium titanate powder according to  claim 1 , wherein the solvent is at least one of a water-based solvent, an organic-based solvent, and a water-based and organic-based solvent. 
     
     
       3. The method of manufacturing barium titanate powder according to  claim 1 , wherein the solvent is ethanol. 
     
     
       4. The method of manufacturing barium titanate powder according to  claim 3 , wherein a concentration of the ethanol in the solvent is 5 vol %. 
     
     
       5. The method of manufacturing barium titanate powder according to  claim 1 , wherein the barium titanate is separated from the slurry by pressurizing the slurry by putting the slurry into a container, heating the slurry from an outside of the container, filling the container with a gas from the outside of the container, and evaporating the solvent from the slurry. 
     
     
       6. The method of manufacturing barium titanate powder according to  claim 5 , wherein the gas is N 2 . 
     
     
       7. The method of manufacturing barium titanate powder according to  claim 1 , wherein the barium titanate is separated from the slurry by pressurizing the slurry by putting the slurry into a container, heating the slurry from an outside of the container, and evaporating the solvent from the slurry. 
     
     
       8. The method of manufacturing barium titanate powder according to  claim 1 , wherein the barium titanate is separated from the slurry by pressurizing the slurry by putting the slurry into a container and filling the container with a gas from an outside of the container. 
     
     
       9. The method of manufacturing barium titanate powder according to  claim 8 , wherein the gas is N 2 . 
     
     
       10. The method of manufacturing barium titanate powder according to  claim 1 , wherein a specific surface area of the barium titanate dispersed in the slurry is 65 m 2 /g. 
     
     
       11. The method of manufacturing barium titanate powder according to  claim 10 , wherein a c/a axis ratio of the barium titanate dispersed in the slurry is 1.0000. 
     
     
       12. The method of manufacturing barium titanate powder according to  claim 1 , wherein a c/a axis ratio of the barium titanate dispersed in the slurry is 1.0000. 
     
     
       13. The method of manufacturing barium titanate powder according to  claim 1 , wherein the slurry is pressurized at 0.2 MPa. 
     
     
       14. The method of manufacturing barium titanate powder according to  claim 1 , wherein the heat treating of the separated barium titanate is carried out at a temperature of 800° C. to 1000° C. 
     
     
       15. The method of manufacturing barium titanate powder according to  claim 1 , wherein a c/a axis ratio of the produced barium titanate powder is 1.009 or more. 
     
     
       16. The method of manufacturing barium titanate powder according to  claim 11 , wherein a c/a axis ratio of the produced barium titanate powder is 1.009 or more. 
     
     
       17. The method of manufacturing barium titanate powder according to  claim 12 , wherein a c/a axis ratio of the produced barium titanate powder is 1.009 or more.